Step by step guide on how to become a proofreader. This guide mentioned on Daily Paid Online dailypaidonline.com will help you to become an advanced proofreader and make extra money from home online. Proofreading is a job where you have to find all the errors in a piece of writing such as grammatical error, spelling error, punctuation error etc. Proofreaders will read their document well from beginning to the end, correct the errors in each of its lines, and finally create a error-free document.